CZ20013024A3 - Support frame for a shadow mask of a display cathode ray tube - Google Patents

Abstract

The support frame for a planar mask pertaining to a cathodic colour display tube, which is generally rectangular in shape, comprises two vertical end members (41,41') that are placed opposite each other and can receive a planar mask, in addition to two side members (40,40') that keep the vertical end members separate from each other. The vertical end members and the side members are generally tubular in shape and are assembled in such a way as to constitute a practically continuous hollow body, whereby it is possible to define a closed planar line that is located fully inside the hollow body and passes inside each vertical end and side member. The inventive support frame can be made by folding a single metal strip or by interlocking two pressed casting moulds. The production method involves folding.

Description

Support frame for flat screen

Technical field

BACKGROUND OF THE INVENTION The present invention relates to a support frame for a flat screen color screen that is simultaneously light, stiff and easy to manufacture.

BACKGROUND OF THE INVENTION

Color screens consist of a metal foil with many holes or slots, called a screen placed between the electron gun and the screen. This screen is intended to obtain a good image and is intended to ensure that the incident beams of electrons on the screen are positioned exactly on the photo-frames placed on the screen.

The screens are supported by frames of generally rectangular shape which hold them in a position adjacent to the screen and, where appropriate, guarantee the reduction of deformations resulting from local heating caused by electron beams.

According to the state of the art, the screen frame consists of two sidewalls consisting of metal tubes or angles and of two crossbars formed by angles or tubes mounted on the side bars joined by welding joints. The structure should be such that the tubes or angles are relatively thick to obtain sufficient rigidity. The frames formed in this way are adapted to the stretched shades, but they are disadvantageously heavy and difficult to manufacture with good geometric accuracy.

According to another known method, the frame for the screen consists of angles formed by a plurality of thin strips shaped as angles and connected by welding. In another variation, the frame is formed by bending of sheet metal in general

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rectangular, having a central cutout also rectangular. The frames thus formed have the advantage that they are lightweight, but have the disadvantage that they are less rigid and therefore poorly adapted to support the screen.

In order to improve the rigidity of the light frames, it is proposed, namely in French patent specification FR 2 749 104, to produce frames from two thin metal strips interconnected by a collar and carrying horizontal and vertical stiffeners. These frames are light and stiff, so they can be used for screen screens, but have the disadvantage that they are often difficult to manufacture.

It is an object of the invention to overcome these disadvantages and to design a lightweight, rigid and easy-to-manufacture screen frame.

SUMMARY OF THE INVENTION

A support frame for a flat screen of a color rectangular screen generally of rectangular shape consisting of two edge beams (4, a ', 41, 41', 80, 96, 108, 112, 117, 11 '' 119, 120, 160) facing each other; According to the invention, the edge beams and the two side walls (3, 40, 40 ', 86, 101, 102, 110, 118, 118' 121, 122, 162) facing each other consist in that the sidewalls are generally tubular in shape and consist of hollow closed bodies practically continuous, comprising at least one closed planar line located fully within the hollow bodies and extending within each edge beam and each sidewall.

The invention therefore relates to a screen frame support frame for a generally rectangular color screen consisting of two opposing edge beams for receiving the screen and two opposing side panels for connection to the edge beams. Beams and sidewalls

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they are generally tubular in shape and consist of 2 hollow bodies practically continuously closed by which they can interleave a closed planar line located entirely within the hollow body and extending within each edge beam and each sidewall. The frame consists of at least one metal thin membrane.

For example, the frame may consist of two metal thin membranes so as to form an outer shell and an inner shell, the two shells being aligned to form a hollow body.

The two shells may be of the same or different material.

The frame may also consist of a metal membrane itself bent to form a hollow body, or a plurality of metal membranes bent such that each form a hollow body forming part of the frame, after which parts of the frame are assembled.

The edge beams intended to accommodate the screen may have a substantially triangular cross-section and have a bend along the top edge to which the screen edge can be welded. They may also have a trapezoidal cross-section to form a top edge wide enough to allow welding of the edge of the screen. The top edge may be rectilinear or curvilinear.

The sidewalls may have a cross-section of any shape, in particular rectangular, or preferably trapezoidal.

In particular, the frame may be designed to accommodate a stretched screen.

The metal membranes from which the frame is assembled are selected from the group consisting of low-carbon steel, an iron-based alloy, an iron-nickel alloy, an ace-chrome alloy, a nickel-based alloy, a structural hardening alloy, a hardenable

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a raartensitic type alloy, a magnetic, non-magnetic alloy, and a vibration damping alloy. If the frame is composed of several materials, the materials can be chosen, for example, such that the coefficient of thermal expansion of the sidewalls is different from the coefficient of thermal expansion of the edge beams.

The invention also relates to a method of manufacturing a frame in which a sheet of metal sheet is cut by a strip having the shape of an unfolded frame or a portion thereof or a plurality of strips having the shape of unfolded complementary portions of the frame. or a part thereof, and if the frame consists of one piece, the edges of the sheet are reinforced by welding, brazing or hemming the edges overlapping each other. If the frame consists of several pieces, each part of the frame is reinforced by welding, soldering or hemming the edges of the tape, which overlap each other and the parts of the frame are then assembled and reinforced by welding, soldering or hemming.

It is preferably welded by laser or electron beam. The screens of the color screen thus formed are both very stiff and very light, and are also easy to manufacture with very good geometric accuracy. In addition, they have very good vibration behavior and particularly significant damping.

The invention will now be described in more detail with reference to the accompanying drawings and practical examples, which are not intended to limit the invention in any way.

List of figures in drawings

- FIG. 1 is a schematic representation of a screen frame on which the screen is partially indicated,

FIG. 2 shows two shells to be assembled to form the screen support frame.

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- Fig. 3 shows a shielding frame made of one bent metal strip,

FIG. 4 shows a quarter of a screen support frame consisting of a single strip of bent metal strip,

- in Fig. 5, a metal strip consisting of four plates separated by cut-outs is intended for the manufacture of a screen support frame consisting of one metal bent strip,

- FIG. 6 is an enlarged sectional view separating two plates of a single strip intended to produce a screen support frame consisting of one metal bent strip,

Fig. 7 is a quarter of a screen support frame consisting of a single bent strip having a recess along the upper edge of the edge beam,

FIG. 8 is the same quarter of the screen support frame as in FIG. 7, but with partial penetration of the wall,

FIGS. 9a and 9b show, in perspective, the front and rear sides of an edge beam whose upper edge is curvilinear,

FIG. 10 schematically shows in a perspective view a quarter connected by an electron beam from an electron source and passing through the screen support frame,

- Fig. 11 is a quarter of a screen support frame whose edge beam has a trapezoidal cross-section,

- Figures 12a, 12b and 12c schematically show, in perspective, one-piece, two-piece and four-piece lampshield support frames,

13a, 13b and 13c schematically show three ways of attaching sidewalls and edge beams,

FIG. 14 is an exploded perspective view of a corner of a screen support frame and a frame mounting foot to the screen,

Fig. 15 is a perspective view of a quarter of a four piece box.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 shows schematically a screen 1 connected to a screen support frame 2. The frame 2 is generally rectangular in shape and consists of beams 4, 4. Shade

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The two side panels 3, 3 and the two edge panels consist of a thin metal foil, for example an iron-nickel alloy with a small coefficient of thermal expansion, provided with a series of holes 5 and welded to the edges 6 of the edge beams 4, 4. Various shapes of the screen are possible and their forms are known to those skilled in the art.

In the particular case of FIG.

the screen has the shape of a part of the cylinder, but can also be planar.

The screen 1 may be tensioned, that is, subjected to tension parallel to the sidewalls 3 (only visible in the figure) of the support frame 2. The screen is tensioned by two opposite forces on the edge beams 4.4 to slightly approach these beams by elastic deformation or welding 6, 6 and releasing the forces acting on the beams.

The above-described frame may be placed on a horizontal surface or on a reference surface, thus above the surface of the horizontal plane. This makes it possible to define, for each frame component, a face or lower edge positioned closer to the reference plane and a face or upper edge located further away from the reference plane. When the screen support frame is embedded in the screen, the faces or upper edges, as defined above, are located on the side of the screen, the faces or lower edges are located opposite (adjacent to the electron gun). For the sake of clarity of the description, it is assumed in the following that the screen support frame is located on a horizontal reference plane.

The stretched screen support frame of the invention has sidewalls and longitudinal members having a generally tubular shape and which consist essentially of a continuous hollow body; By virtually continuous hollow body is meant a hollow body, the inner part of which may be obstructed in places. The sidewalls and edge beams are positioned such that it is possible to guide a full surface closed line fully contained in the hollow body and passing through the interior of each of the sidewalls and edge beams. This is the structure that delivers

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In the frame according to the invention, stiffness, namely since the stress is transmitted by 2 framed beams to the sidewall according to a line located inside the fifth wheel. Different implementation methods are possible. Several are described as examples.

In the first embodiment (FIG. 2), the frame 8 consists of an outer shell 10 and an inner shell 30 aligned with each other to form a continuous hollow body. Both shells are obtained by drawing a sheet metal blank of generally rectangular shape with a rectangular center cutout. Each of these two shells forms a metal membrane.

The outer shell 10 has the shape of a rectangular box consisting of edge walls 14, 14 and side walls 16, 16 and a bottom opened by a large rectangular slot 11 which can be replaced by a strip 12 extending into the entire inner circumference of the outer shell. The edge of the strip 12 defining a rectangular cut-out 11 is chamfered upward to form a skirt. The two edge walls 14, 14 have a top edge 15,1.5 in the form of a circular arc,

Both side walls 16, 16 'have a chamfer 19 of a kind such that the height of the central portion 17 is less than the height of the edges 18a, 18b. The top flanges of the edge walls 14, 14 and the sidewalls 16, 16 form a continuous upper edge 20 having a bend 21 oriented outside the inner shell (in another variation, the bends may be oriented towards the inner shell). The corners 22 are clipped to form a beveled triangular surface that can be used to secure the frame retaining means within the screen.

The inner shell 30 has a shape complementary to that of the outer shell 10, having a complex shape formed by two nearly planar outermost angled faces 31, 31 and two side cylindrical faces 32, 32. This surface is defined by both an outer edge 33 having an outward bend 34 whose shape and dimensions are identical to those of the outer edge 20 of the outer shell 10, and an inner edge 35 with an inward bend 36 having a shape and dimensions identical to the rectangular cutout dimensions 11 at the bottom of the outer shell 10.

The screen support frame is obtained by inserting the inner shell 30 into the outer shell 10 in such a way that:

- the outer edge 33 of the inner shell 30 comes into contact with the upper edge 20 of the outer shell 10,

the inner flange 36 of the inner shell 30 comes into contact with the outer shell strip 12, the flange 3 of the tape 12 being woven into the opening defined by the outer flange 36 of the inner shell 30.

The two shells are joined along their edges by welding, soldering or hemming.

The shells so connected form a continuous hollow body of generally rectangular shape and a flat bottom when the sidewalls and edge beams are located in the same plane. This structure has the advantage that it is both very rigid and very light and has very good geometric accuracy.

Stiffness is sufficient, as the screen support frame may consist of two shells, the thickness of which may vary between 200 µm and 1500 µm depending on the shape of the screen and the type of alloy used, and may serve as a hollow screen support frame.

Other forms may also be realized, in particular the edges may be all rectangular, the side walls of the inner shell may be provided with reinforcing ribs, the surfaces of the outer shell may be more or less planar or more or less gathered.

Both shells are of the same metal material including low carbon steel, iron-based alloy, iron-nickel alloy, iron-chromium alloy, nickel-based alloy, structural hardening alloy, hardenable martensitic alloy, magnetic alloy, non-magnetic alloy and vibration damping alloy.

• · • · ♦

The two shells may be of the same material or of different materials having, for example, different coefficients of thermal expansion,

Each shell may be of two different materials, one forming shunts and one forming edge beams of the screen support frame. To this end, each shell is made of a composite obtained by welding strips of alloys having a different nature. If the frame is designed to support a stretched screen, the materials can be selected such that the thermal expansion coefficient of the sidewalls is different from the thermal expansion coefficient of the edge beams, allowing to create a species that ultimately ensures that the screen tension is little affected by temperature fluctuations during screen manufacturing.

In the second embodiment, the screen support frame consists of a continuous hollow body, or a practically continuous, rectangular obtainable by flanging a metal strip suitably cut. The metal strip, pre-cut in the manner described in detail below, is bent to form generally hollow beams, operating to guide a closed surface line within the hollow body passing through the interior of each hollow beam. The screen support frame therefore consists of one metal membrane alone.

The screen support frame 39 (FIG. 3) comprises two sidewalls 40.

rectangular cross-section and two edge beams 41, 41 of triangular cross-section. The sidewalls 40, 40 are lower than the edge beams 41, 41 such that the edges 43, 43 of the edge beams 41, intended to receive the screen (not shown) are raised.

The lower corners 42 at the joint between the side beams and the edge beams are cut off to form a beveled triangular surface that can serve to attach the frame catching means within the screen.

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As can be seen in FIG. 4, each sidewall 40 is obtained by bending the tape such that two single bars 44 and 45 are of a single thickness and two double bars 46 and 47 are of double thickness to increase rigidity of the assembly. The single partition 44 may be provided with apertures 48 allowing the introduction of solder means to reinforce the two thicknesses of the double partition 47 by soldering.

The apertures 48 are not necessary if soldering along the edge 51 at the contact of the single rung 45 and the double rung 47 of the sidewall 40, or laser soldering from the outside, for example continuous line laser or spot laser soldering along the double rung 47.

As can also be seen from FIG. 4, an edge beam 41 is obtained by bending a strip whose edges are bent to form bends 49 and 50 that fit together to form an upper edge 43 for receiving the screen. The rigidity of the assembly is guaranteed by soldering along the bend 50.

The frame thus assembled forms a virtually continuous hollow body, consisting of sidewalls and edge beams whose lower faces lie in the same plane.

The frame 39 described below (FIG. 5) can be made from a single strip having the shape of an unfolded frame. This form is achieved when the frame opens at one of its corners, then bends to align all of its hollow sections and then bends the walls of the hollow sections. The strip thus obtained allows the frame to be assembled by bending.

The strip 60 consists of two plates 61, 61 'corresponding to the edge beams 41, 41 and two plates 62, 62 corresponding to the sidewalls 40, 40 arranged alternately. Two consecutive plates 61 and 62 are interrupted by a cutout 63, the shape of which is such that after bending of the sidewall and the edge beams, they interlock and the corner remains interrupted. The bends take place along the marked lines.

As can be seen in FIG. 6, the bending of the plate 61 corresponding to the edge web 41 is performed along the two main lines aa and bb, thereby: forming the faces 54, 55 and 56 of the edge web with a triangular cross section and according to two additional lines cc and dd edges 49 and 50.

The plate 62 corresponding to the sidewall 40 is bent along five lines ee, ff, gg, hh and ii to form a rectangular cross-section. The cutout 63 leaves a small diamond-shaped strip 64 carrying on one side a triangle 65 corresponding to the cut-off corner 42 of the frame and on the other side a circumference 66. The triangle 65 also carries two bends 67.

On the side of the plate 61, the cutout leaves a right edge 68 and a triangular cutout 69 to form a cut off corner 42.

On the side of the plate 62, the cutout leaves a broken line 70 defining portions protruding and receding which, after bending, ensures good alignment of the sidewalls and the edge beams.

After bending, the various cooperating parts are strengthened by welding, namely along all the visible edges from the outside and which do not correspond to the bends. This is particularly the case for the edges 52 and 53 corresponding to the joint between the sidewall 40 and the edge beam 41 of the edge 50,

The screen support frame thus formed consists of a continuous, very rigid and light hollow body and, by having very good geometric accuracy, is easy to manufacture. It also shows the advantage that it has a very favorable vibration behavior, especially for its excellent attenuation properties. This frame is particularly well suited for supporting a stretched screen.

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As in the previous case, the screen support frame may be of a metallic material including low carbon steel, an iron-based alloy, an iron-nickel alloy, an iron-chromium alloy, a nickel-based alloy, a structural hardening alloy, a hardenable martensitic alloy, an alloy magnetic, non-magnetic and vibration-damping alloy.

The strip may also be a composite, wherein the plates 61, 61 may be of one alloy and the plates 62,62 of the other alloy.

In a preferred variant produced by the previous method (FIGS. 7 and 8), the edge beam 80 has a triangular cross section as in the previous case and has a stop 84 for receiving the screen along its entire length 83. The inclined wall 81 connects to the vertical wall 82 exactly along the upper edge 83 just below the stop 84, and the assembly is achieved by a series of spot welds at the bottom of the recess 85 positioned along the edge of the inclined wall 81. These recesses are carried out, for example, at deep tension before bending the membrane. This treatment has the advantage of increasing the mechanical resistance of the upper edge 83.

The side beam 86 has a square cross section whose wall 37 itself has a double thickness. The two wall thicknesses 87 are reinforced by a series of spot welds (not shown) distributed over the entire length of the side beam. These spot welds, for example, are made from the outside by a laser. The welding can also be performed in the form of a seam or several continuous seams.

As shown in FIG. 8, the sidewall 86 is embedded in the edge beam 80 by penetrating inwardly such that the lower face 93 rests on the lower face 88 of the edge beam, allowing them to be reinforced by a laser weld 2 on the outside. The sidewalls 86 can be inserted up to the vertical wall 82 of the edge beam, in which case the hollow body is almost continuous or, on the other hand, stops before contact with the vertical wall 82 and in this case the hollow body is continuous, φφ φφ · · · φ

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Žádná protože protože protože protože žádná žádná žádná žádná žádná žádná žádná žádná žádná žádná žádná žádná žádná žádná žádná žádná žádná žádná žádná žádná žádná žádná žádná žádná žádná žádná žádná žádná žádná žádná žádná žádná žádná žádná žádná žádná žádná žádná žádná protože stě It can be noted that the length of the sidewall portion 92 that is within the edge beam has a strong effect on the rigidity of the assembly and that this rigidity can optionally be adjusted by selecting this length.

The joining of the edge beam 80 to the sidewall 86 is mediated by welding-reinforced flanges 89, 90, 94 with the adjacent wall. It can be seen that the rim 89 allows the outer wall 87 of the side beam 86 to be reinforced with the inclined wall 81 of the edge beam 80. In fact, the wall 87 extends by the trapezoidal rim 87 partially visible in Figure 8, which includes the outside of the edge beam 80. an advantage in improving the stiffness of the edge beam.

9a and 9b, the outer edge 95 of the edge beam 96 to receive the screen may be curvilinear; the curve formed by the outer edge 95 lies neither in the vertical nor in the horizontal plane. In this case, in order to allow a good fit of the vertical face 97 with the inclined face 98, the two faces of the extended zones 99 and 100 form surfaces that can join along the outer edge 95. These extended zones have a generally convex shape whose bulge is preferably oriented inside the beam, which improves its mechanical behavior. Longitudinal edge beams 101 a

102 are not modified from the previous solution.

In another embodiment, the sidewalls have a square cross-section. However, to maximize the effects of shielding on the shield sidewalls, the sidewalls may have a trapezoidal or triangular cross section. Referring to FIG. 10, an electron source 105 disposed below the screen support frame 106 emits an electron beam that impinges on the front of the pyramid volume indicated by the dashed lines 107. The edge beam 108 of the screen support frame 106 has a triangular cross-section and has an inclined front 109 virtually parallel. with the Pyramid Head-

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The side beam 110 has a trapezoidal cross-section with a face 111 inclined substantially parallel to the vapor volume face indicated by the dashed lines 107.

It is also recalled that, as shown in FIG. 11, the edge beam 112 may also have a trapezoidal cross section and have a narrow upper face 113 for receiving the screen.

In another embodiment, which is further described in various variations, the frame is made of a suitably cut metal strip and then bent to form a hollow body with welded reinforced parts.

If the dimensions of the frame are not very significant, it can be made from one piece 115 as indicated in FIG. 12a, while the frame has large dimensions, the developed length is such that handling a tape of such length is difficult. Thus, it is possible to assemble the frame of several pieces obtained by bending, which are then assembled. For example, it is possible to make a frame of two pieces 116, 116 * consisting of sidewalls 117,117 and edge beams 118,118. The frame can also be made of four pieces with two edge beams 119 and 120 and two side panels 121 and 122.

The disclosed embodiments are not limiting. Other equivalent shapes are also possible. In particular, the sidewalls cannot consist of walls of double thickness, but simply one wall to the other to facilitate welding. There may be no stops, just butt welding. Also, the double-thickness walls are not necessarily external or internal walls as indicated in the drawings, but all walls as may be selected by those skilled in the art, for example according to manufacturing conditions, to facilitate production. Similarly, the upper side face of the side wall to accommodate the screen does not need to have a stop, while the screen can be cooked in a suitable manner, which can be selected by a person skilled in the art according to. The functions of the means of production available (for example, electrode welding along edges).

Other variants are possible, namely if the frame is made of several parts. For example, as shown in FIG. 15, the edge beams 160 may include protrusions 161, sidewalls 162, which are therefore tubes inserted into or into which the projections are inserted.

In the same way, the frame can be made by other types of bending. In particular, it is possible to bend from the cut blank corresponding to the deployment of the frame in a manner different from that described above.

In all described methods, the lower faces of the sidewalls and the edge beams are situated in the same plane. With this disposition, from the mechanical point of view of the structures, the edge beams are supported on the sidewalls. This characteristic can be obtained with various configurations as shown in Figs. 13a, 13b and 13c. In these three cases, the top face 132 of the sidewall is below the top edge stop 133 and the bottom face 130 of the edge beam is either in the same plane as, or is above, or below, but above the top face 132 of the sidewall. In all cases, it is possible to define at least one plane P in which it is possible to draw a completely enclosed curve located within the hollow body which forms the frame, guided inside each beam. An example of a continuous line is shown in Figure 8, where the P plane and the AA line are indicated by the dashed line. In this figure, however, only a quarter of the frame is visible, but it is understood that it joins the four corners of the frame, extending the AA line to a closed continuous line lying in the P plane and extending through the four cavities of the frame. In this figure, the sidewall 93 is not guided to the outer wall 82 of the edge beam 80, so that the hollow body continues. In another variation, the sidewall 93 could extend to the outer wall 82 of the edge beam. In this case

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the line AA would necessarily pass through the portion 92 of the sidewall 93 which is located inside the edge beam so that the hollow body would not be absolutely continuous but practically continuous as it is interrupted locally by the inner walls. This variant illustrates what we call practically continuous.

When mounted to the screen, the support frame for the flat screen is fixed in position by feet, which may have different shapes by welding, snapping or screwing.

The foot 140 (FIG. 14) is attached to the frame by a bracket 141 either by snapping or screwing. To this end, the shoe comprises 2e of two tongues 144 and 1.45 and of two apertures 148 and 144 (in each corner designated for one shoe), of two slots 142 and 143 and of two apertures 150 and 151. 140 to the slots 142 and 143, and the screws are screwed 146 and 147 through the holes 148 and 149 in the holes 150 and 151. This hole can be used to drain the cleaning fluids used during the frame manufacturing process. They can also be used to adjust the deformation of the frame when forces are applied to the two sidewalls before the screen is fed. This adjustment can be done by selecting a suitable hole shape.

Technical usability

An easy way to fabricate screen shade support frames that are light and stiff.

jUDr. Petr Kalensky attorney

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Claims (28)

PATENT CLAIMS 1. Support frame for the flat screen of the color screen generally rectangular in shape, consisting of of two peripheral (4, 4, 41, 41, 80) 96, 108, 112 117, 117 ' 119, 120, 160) placed against each other and intended for storage shades and that two sidewalls (3,40, 40, 86, 101, 102, 110 118, 118 ' 121, 122, 162) placed against each other, confesses č u j í c and s e wherein the edge beams and sidewalls are generally tubular in shape and consist 2 hollow closed bodies practically continuous, comprising at least one closed planar line located fully within the hollow bodies and extending within each edge beam and each sidewall. Ξ. Frame according to claim 1, characterized in that it is formed from at least one thin metal membrane. A frame according to claim 1 or 2, characterized in that it consists of a single metal membrane bent to form a hollow body (115). A frame according to claim 1 or 2, characterized in that it consists of two half-frames joined to each other, wherein each half-frame (116, 116) consists of 2 one sidewall (11S, 118) and 2 one edge beam (117, 116). 117) and each half-frame is made of a single bent metal membrane. Frame according to claim 1 or 2, characterized in that it consists of two edge beams (119, 120, 160) and two sidewalls (121, 122, 162) connected to each other, wherein each edge beam and each sidewall is made of a bent metal membrane. Frame according to claims 3 to 5, characterized in that the at least one edge beam (41, 41, 80, 96) has M 4 « • 4 44 * 4 • 4 * 4 4 4 4 « 4 «· • 4 4 4 4 ·· 4 4 4 · 4 ì ♦ 4 4 4 • 444 44 44 44 44 4 cross section generally triangular. Frame according to Claim 6, characterized in that the at least one edge beam (41, 41, 80, 96) is provided along its upper edge (43, 83) with a bend (49, 84) forming a wide strip to accommodate Shades Frame according to claim 6 or 7, characterized in that the at least one edge beam (80,96) has a series of recesses (85) at one of the two adjacent faces (81, 98) at the upper edge (83, 95). ) located along the upper edge and intended to be assembled by welding two adjacent faces. Frame according to claims 6 to 8, characterized in that the upper edge (95) of the edge beam (96) to receive the screen is curvilinear. Frame according to claim 9, characterized in that the at least one face (97, 98) of the edge beam (96) adjacent to the upper edge (95) to receive the screen has a bulge zone (99,100) such as to allow two adjacent faces cooperate smoothly along the top edge. Frame according to claims 6 to 10, characterized in that the edge beam (41, 41, 80, 96, 108, 117, 117, 119, 120) having a triangular cross-section has a face (56, 81, 98) 109) facing inwardly of the frame, inclined relative to the plane of the frame. Frame according to claims 3 to 5, characterized in that the at least one edge beam (112) has a generally trapezoidal cross-section and is provided with an upper face (113) in the form of a wide strip for receiving the screen. Frame according to any one of claims 3 to 12, characterized in that the sidewalls (40, 40, 86, 101, 102, 118, 118, 121, 122). 0 ·· ······················ · 0 ··· 0 00 00 ·· ♦ the cross section is generally rectangular. Frame according to claims 3 to 12, characterized in that the at least one sidewall (110) has a generally trapezoidal cross-section and has a face (111) facing inwardly of the frame inclined relative to the plane of the frame. Frame according to claim 13 or 14, characterized in that at least one face (46, 47, 87) of the sidewall (40, 40, 86, 101, 102, 110, 118, 118, 121, 122) is equipped with at least two thicknesses of the metal membrane. 16. A frame according to claim 15, wherein at least two thicknesses of the metal membrane are reinforced by a series of spot welds along the rim or weld seam. Frame according to claims 3 to 16, characterized in that the sidewalls (40, 40, 86, 101, 102, 110, 118, 118) 121, 122) are assembled with edge beams (41, 41, 80, 96, 108, 117, 117, 119, 120). Frame according to any one of claims 3 to 17, characterized in that the edges of one or more of the cooperating metal membranes are reinforced by welding, for example by laser welding. 19. A frame according to any of claims 3 to 18, wherein the metal membrane is a metal material selected from the group consisting of low carbon steel, an iron-based alloy, an iron-nickel alloy, an iron-chromium alloy, a nickel-based alloy, a structural curing alloy, a hardenable martensitic type alloy, a magnetic alloy, a non-magnetic alloy, and a vibration damping alloy. 20 May Frame according to claims 3 to 18, characterized in that the metal membrane is 2e two metallic materials selected from the group consisting of low carbon steel, iron-based alloy, iron-nickel alloy, iron-chromium alloy, nickel-based alloy, structural hardening alloy, hardenable martensitic alloy, magnetic alloy, non-magnetic alloy and vibration damping alloy. Frame according to claim 20, characterized in that the two materials are selected and arranged such that the coefficient of thermal expansion of the sidewalls (40, 40, 86, 101, 102, 110, 118, 118, 121, 122, 162) was different from the coefficient of thermal expansion of the edge beams (41, 41, 80, 96, 108, 117, 11 ', 119, 120, 160). A frame according to claim 1 or 2, characterized in that it consists of two thin metal membranes, the first thin metal membrane forming the outer shell (10) and the second thin metal membrane forming the inner shell (30) and both shells. assemble each other to form a hollow body. Frame according to claim 22, characterized in that at least one membrane (10, 30) is obtained by pulling out a thin metal sheet of substantially rectangular shape having a rectangular opening in its center. Frame according to claim 22 or 23, characterized in that each membrane (10, 30) consists of at least one metal material selected from the group consisting of low carbon steel, an iron-based alloy, an iron-nickel alloy, an iron-alloy alloy. chromium, a nickel-base alloy, a structural hardening alloy, a hardenable martensitic type alloy, a magnetic alloy, a non-magnetic alloy, and a vibration damping alloy, both of which may be either of the same or different material. 4, wherein at least one shell consists of two different materials. 26. A frame as claimed in any one of claims 1 to 25, characterized in that it is intended to receive a stretched screen. A method of manufacturing a frame according to claims 3 to 22, characterized in that a strip (60) having the shape of an unfolded frame or a plurality of strips having the shape of the unfolded complementary parts of the frame is cut from metal sheet; of the frame and, if the frame is made in one piece, the edges of the tape are reinforced by welding, soldering or hemming and if the frame is made of several pieces for each part of the frame, the edges of the tape are reinforced by welding , soldering or hemming and parts of the frame are strengthened by welding, soldering or soldering 1emování í m. 28. The method of claim 27, wherein the welding is a laser or electron beam welding performed from outside the frame. A color screen having a screen and a support frame made according to claims 1 to 28. (modified by the International Bureau on May 5, 2000 (May 5, 2000, claim 29 attached, other claims remain unchanged)